The initial velocity of the train is 12.56 m/s.
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Initial velocity</h3>
The initial velocity of the train can be determined by using the first kinematic equation as shown below;
v = u + at
u = v - at
where;
- v is the final velocity = 110 km/h = 30.56 m/s
- u is the initial velocity
u = 30.56 - (36 x 0.5)
u = 12.56 m/s
Thus, the initial velocity of the train is 12.56 m/s.
Learn more about initial velocity here: brainly.com/question/19365526
False. The closest galaxy known to us is the Canis Major Dwarf Galaxy which is 236,000,000,000,000,000 km (25,000 light years) from the Sun.
30 + 6 = 36
36/12 = 3
So, it would take it 3 hours to go 12 kms downstream.
Note that we added 30 and 6 because it was going downstream. If it was going upstream, then we would have had to subtract.
Answer: 588 joules
Explanation:
Work is done when force is applied on an object over a distance ( whether vertical or horizontal). It is measured in joules.
Thus, Workdone = Force X distance
- Vertical distance to be moved by the brick = 12 metres
- Mass of box = 5kg
- Acceleration due to gravity when box was lifted represented by g is a constant with value of 9.8m/s^2
Now, recall that Force = Mass x acceleration due to gravity
i.e Force = 5kg x 9.8m/s^2
Force = 49 Newton
So, Workdone = Force X Distance
Workdone = 49 Newton X 12 metres
Workdone = 588 joules
Thus, 588 joules of work was done.
3. Football: The first law takes place before the snap. When the quarterback is still calling out his play, everyone including the ball, are still. The ball remains motionless until it is acted upon by the center. The center flings the ball back to the quarterback causing it to go into motion, then remains motionless until the quarterback throws the ball to a wide receiver for a touchdown. When the defensive lines meet, the heavier players such as New England's Vince Wilfork, require much more force applied to them to move them out of the way than it would to hit Julian Edelman which explains the second law. This can also explain the third law as well. When one defensive line pushes against another, they both apply force to each other and if they are the same strength, the reaction for one lineman is the others opposite re-action